Java replace all non-HTML Tags in a String

Question

I'd like to replace all the tag-looking parts in a String if those are not valid HTML tags. A tag-looking part is something enclosed in <> brackets. Eg. <[email protected]> or <hello> but <br>, <div>, and so on has to be kept.

Do you have any idea how to achieve this?

Any help is appreciated!

cheers,

balázs

Answer 1

You can use JSoup to clean HTML.

String cleaned = Jsoup.clean(html, Whitelist.relaxed());

You can either use one of the defined Whitelists or you can create your own custom one in which you specify which HTML elements you wish to allow through the cleaner. Everything else is removed.

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Your specific example would be:

String html = "one two three <blabla> four <text> five <div class=\"bold\">six</div>";
String cleaned = Jsoup.clean(html, Whitelist.relaxed().addAttributes("div", "class"));
System.out.println(cleaned);

Output:

one two three  four  five 
<div class="bold">
 six
</div>